KABUL: Former head of the Afghan National Directorate of Security (NDS) Rahmatullah Nabil and ex-US ambassador to Afghanistan Zalmay Khalilzad have said, that the killing of the Taliban's leader Mullah Akhtar Mansour in Pakistan territory could be a dangerous issue for Pakistan.

Speaking to TOLOnews, Khalilzad said that Pakistan will change into a second North Korea by pursuing a partial policy of supporting the militants.

According to Khalilzad, the attack could expand rifts within the group if  Sirajuddin Haqqani  was appointed  Taliban's new leader.

The U.S drone strike on Mansour, 70 kilometers inside Pakistani territory, has drawn strong reactions from the U.S and Afghan intelligence officials and politicians, the TOLO News said.

According to Nabil meanwhile, the attack has complicated facets, but that it will increase the morale of the Afghans security forces on the battlefields.

"I think there are three important aspects to Mullah Akhtar Mohammad Mansour's killing, the first issue is that if the attack came as part of a joint intelligence sharing mission between Pakistan and the US, then Pakistan would have taken the decision for its national interests as part of Pakistan's struggle to reduce US criticism. The second is that Pakistan strived to nominate Sirajuddin Haqqani as deputy head of the Taliban's military wing, however Pakistan did this in line with its own interests, Nabil said.

Meanwhile, former U.S ambassador to Afghanistan Zalmai Khalilzad has said that the U.S can increase pressure on Pakistan.

"Targeting the Taliban leader inside Pakistani territory itself is a big issue. Because the U.S had rejected the assumption that Taliban leaders will not be targeted inside Pakistan. Following this, the Taliban leaders will live there with fear and they (Taliban) must realize that they are no longer safe in their hideouts and the one who rejects peace with the Afghan government will be killed, this indicates that the U.S policy toward Pakistan is now harsher and pressure has increased," said Khalilzad.